SEGMENT INFORMATION - Schedule of Segment Profitability and Reconciliation to Net Income (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Jun. 30, 2026 |
Mar. 31, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Mar. 31, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Segment Reporting [Line Items] | ||||||||
| Operating revenues | $ 892.0 | $ 793.4 | $ 2,609.8 | $ 2,311.9 | ||||
| Amortization of intangible assets | 45.2 | 41.0 | 130.9 | 128.6 | ||||
| Depreciation and amortization of property, equipment and leasehold improvements | 6.5 | 5.8 | 18.6 | 15.9 | ||||
| Acquisition-related integration and transaction costs | 1.0 | 0.0 | 2.0 | 0.0 | ||||
| Operating income | 502.1 | 447.6 | 1,446.5 | 1,249.9 | ||||
| Other expense (income), net | 74.2 | 51.1 | 212.1 | 144.5 | ||||
| Income before provision for income taxes | 427.9 | 396.5 | 1,234.4 | 1,105.4 | ||||
| Provision for income taxes | 76.9 | 71.2 | 135.4 | 187.8 | ||||
| Net income | 351.0 | $ 342.0 | $ 406.0 | 325.3 | $ 303.7 | $ 288.6 | 1,099.0 | 917.6 |
| Total reportable segment operating revenues | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Operating revenues | 817.3 | 723.4 | 2,387.8 | 2,103.4 | ||||
| Adjusted EBITDA expenses | 281.0 | 248.4 | 839.1 | 762.5 | ||||
| Adjusted EBITDA | 536.3 | 475.0 | 1,548.7 | 1,340.9 | ||||
| Index | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Operating revenues | 532.6 | 451.1 | 1,539.9 | 1,307.7 | ||||
| Adjusted EBITDA expenses | 120.2 | 100.9 | 354.5 | 315.7 | ||||
| Adjusted EBITDA | 412.4 | 350.2 | 1,185.4 | 992.0 | ||||
| Analytics | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Operating revenues | 191.0 | 182.2 | 570.4 | 532.1 | ||||
| Adjusted EBITDA expenses | 105.3 | 92.1 | 313.9 | 273.4 | ||||
| Adjusted EBITDA | 85.7 | 90.1 | 256.5 | 258.7 | ||||
| Sustainability and Climate | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Operating revenues | 93.7 | 90.1 | 277.5 | 263.6 | ||||
| Adjusted EBITDA expenses | 55.5 | 55.4 | 170.7 | 173.4 | ||||
| Adjusted EBITDA | 38.2 | 34.7 | 106.8 | 90.2 | ||||
| All Other - Private Assets | ||||||||
| Segment Reporting [Line Items] | ||||||||
| Operating revenues | 74.7 | 70.0 | 222.0 | 208.5 | ||||
| Adjusted EBITDA | $ 18.5 | $ 19.4 | $ 49.3 | $ 53.5 | ||||
| X | ||||||||||
- Definition Adjusted EBITDA Expense No definition available.
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- Definition Business combination integration related costs and transaction costs. No definition available.
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- Definition The operating profitability of each segment, reflecting adjusted earnings before interest, taxes, depreciation and amortization. No definition available.
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- Definition Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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